[SCSI] isci: remove unused 'isci_tmf->device' field

As the field was never set, isci_print_tmf() using 'isci_tmf->device'
sometimes causes a kernel crash if the dev_dbg() statement is enabled.
Remove the unused field both from isci_tmf struct definition and from
isci_print_tmf()

Signed-off-by: Maciej Trela <maciej.trela@intel.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Signed-off-by: James Bottomley <JBottomley@Parallels.com>

drivers/scsi/isci/task.c

@@ -496,7 +496,7 @@ static int isci_task_execute_tmf(struct isci_host *ihost,
 		}
 	}
 
-	isci_print_tmf(tmf);
+	isci_print_tmf(ihost, tmf);
 
 	if (tmf->status == SCI_SUCCESS)
 		ret =  TMF_RESP_FUNC_COMPLETE;

drivers/scsi/isci/task.h

@@ -106,7 +106,6 @@ struct isci_tmf {
 	} resp;
 	unsigned char lun[8];
 	u16 io_tag;
-	struct isci_remote_device *device;
 	enum isci_tmf_function_codes tmf_code;
 	int status;
 
@@ -120,10 +119,10 @@ struct isci_tmf {
 
 };
 
-static inline void isci_print_tmf(struct isci_tmf *tmf)
+static inline void isci_print_tmf(struct isci_host *ihost, struct isci_tmf *tmf)
 {
 	if (SAS_PROTOCOL_SATA == tmf->proto)
-		dev_dbg(&tmf->device->isci_port->isci_host->pdev->dev,
+		dev_dbg(&ihost->pdev->dev,
 			"%s: status = %x\n"
 			"tmf->resp.d2h_fis.status = %x\n"
 			"tmf->resp.d2h_fis.error = %x\n",
@@ -132,7 +131,7 @@ static inline void isci_print_tmf(struct isci_tmf *tmf)
 			tmf->resp.d2h_fis.status,
 			tmf->resp.d2h_fis.error);
 	else
-		dev_dbg(&tmf->device->isci_port->isci_host->pdev->dev,
+		dev_dbg(&ihost->pdev->dev,
 			"%s: status = %x\n"
 			"tmf->resp.resp_iu.data_present = %x\n"
 			"tmf->resp.resp_iu.status = %x\n"